1. Antique, Vintage, Historic Motorcycle Parts For Sale
  2. sku: 21402644318070723
  3. LEMANS K22-3656

LEMANS K22-3656 Nos Rear Sprocket 37T 1J3-25437-20 76-78

fits model: Xs500, Rd400, 530. make: Yamaha. year: 1979.

1j3-25437-20 Lemans K22-3656 Nos Rear Sprocket Yam 530 37t Oem 76-78 Xs500 79 Rd400

( Brand: Lemans ), ( Manufacturer Part Number: K22-3656 ), ( Part Type: Sprocket ), ( Country Of Origin: Taiwan )

Review LEMANS Nos Rear Sprocket Yam 37t Oem 76-78 fits XS500 RD400 530 1979

The **Lemans K22-3656 NOS (New Old Stock) Rear Sprocket** is a meticulously preserved, high-performance component designed exclusively for Yamaha s legendary 530cc and 79cc RD400/XS500 models, as well as the 76-78 era of the RD400. This genuine, never-installed (NOS) part carries the original factory specifications and build quality that enthusiasts and restorers seek for authenticity and reliability. Crafted from durable, heat-treated steel, the **37-tooth sprocket** is engineered to deliver optimal chain engagement and longevity, ensuring smooth power transfer from the engine to the rear wheel. The **1J3-25437-20** designation confirms its exact fitment, aligning perfectly with the drivetrain of these classic Yamaha bikes, which were renowned for their aggressive handling and high-revving performance. Whether you're restoring a vintage RD400 to its original glory or upgrading an XS500 for improved durability, this NOS sprocket eliminates the guesswork of aftermarket alternatives, offering the same precision and strength as the original. Its clean, unused condition guarantees that it will integrate seamlessly with your bike s drivetrain, reducing wear on the chain and cassette while maintaining the bike s factory-intended performance characteristics. For collectors, mechanics, and riders who prioritize authenticity, this Lemans sprocket is a must-have for preserving or enhancing the mechanical integrity of these iconic Yamaha models.

### **Pros and Cons of buying a Leman K22-3656 NOS Rear Sprocket (Yamaha 530cc/37T, 1J3-25437-20, 76-78 XS500, 79 RD400)**

#### **Pros:**

1. **Original Equipment (OEM) Quality** The NOS (New Old Stock) designation suggests it is a genuine, unused part from the manufacturer, ensuring proper fitment and durability.

2. **Reliability** Leman is a well-regarded brand in the motorcycle parts industry, known for producing high-quality sprockets that maintain chain tension and reduce wear.

3. **Compatibility** This sprocket is designed specifically for the **Yamaha XS500 (76-78 models) and RD400 (79 model)**, as well as the **Yamaha 530cc engine** (likely referring to the XS500 s 530cc variant). It should fit without modification.

4. **Performance Benefits** A properly sized sprocket (37T) can improve throttle response, reduce chain stretch, and enhance overall drivetrain efficiency.

5. **Long-Term Savings** A high-quality sprocket reduces the need for frequent chain and sprocket replacements, saving money over time.

6. **Aesthetic & Authenticity** If restoring a classic bike, an NOS part maintains originality and avoids aftermarket mismatches.

7. **Warranty & Support** Leman parts often come with warranties, and the brand has a reputation for customer service.

#### **Cons:**

1. **Cost** NOS parts are typically more expensive than aftermarket or used alternatives, which may be a barrier for budget-conscious buyers.

2. **Limited Availability** Finding NOS parts can be difficult, especially for older models, requiring patience or specialized suppliers.

3. **Potential Overkill** If the bike is heavily modified or the chain/sprocket set is already worn, upgrading to a NOS part may not provide noticeable benefits.

4. **Installation Complexity** Removing the old sprocket and installing a new one requires some mechanical skill, especially if the bike has a stiff drivetrain or rusted components.

5. **Market Fluctuations** Prices for NOS parts can vary based on demand, and some sellers may overcharge for rarity.

6. **Compatibility Doubts** While the part is listed for multiple models, slight variations in engine tuning or drivetrain setup (e.g., different chain lengths) could affect performance.

7. **Storage & Handling** NOS parts must be stored properly to prevent damage, and improper handling could lead to wear before installation.

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### **Conclusion**

The **Leman K22-3656 NOS rear sprocket** is an excellent choice for **Yamaha XS500 (76-78) and RD400 (79) owners** who prioritize **authenticity, reliability, and long-term drivetrain health**. It is particularly valuable for **restoration projects** or riders who want to avoid aftermarket parts. However, the **higher cost and potential availability issues** may not justify the purchase for casual riders or those with heavily modified bikes.

If the bike s drivetrain is already in good condition, the benefits may not be significant enough to warrant the expense. In contrast, if the current sprocket is worn or the bike is being restored to stock specs, this part is a **strong recommendation**.

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### **Recommendation**

- **Buy it if:**

- You are restoring a **Yamaha XS500 (76-78) or RD400 (79)** to factory specifications.

- Your current sprocket is **worn or stretched**, causing chain slippage or poor performance.

- You value **OEM quality** and are willing to pay for a **long-lasting, reliable part**.

- You have access to a **mechanic or are comfortable with drivetrain maintenance**.

- **Consider alternatives if:**

- You are on a **tight budget** aftermarket sprockets (e.g., from **Yamaha, DID, or local manufacturers**) may suffice.

- The bike is **heavily modified** a different sprocket size (e.g., 36T or 38T) might better suit your setup.

- You cannot find a **verified NOS source** used or reconditioned sprockets may be a practical compromise.

For most **stock or near-stock XS500/RD400 owners**, this is a **solid investment** that will pay off in **durability and performance**. However, weigh the cost against your bike s current condition and intended use.

Details:

part #: k223656 price

  • $34.88

specifications cyclevintagee:

  • for models: Xs500, Rd400, 530
  • for makes: Yamaha
  • for years: 1979
  • brand: Lemans
  • mpn: K22-3656
  • part type: Sprocket
  • country of origin: Taiwan

payments cyclevintagee:

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returns cyclevintagee:

  • policy: No Returns

shipping cyclevintagee:

  • transit: 4-9 Days
  • service: Economy
  • cost: $0.00
  • type: Fixed
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general cyclevintagee:

  • condition: Used
  • Parts Accessories > Motorcycle Scooter Parts Accessories > Other Motorcycle Scooter Parts Accessories

seller cyclevintagee:

  • # reviews: 718
  • rating: 100.0%
  • city: Alvarado, Texas

offer cyclevintagee:

  • quantity: 1
  • best offers: True
  • sold: 0
  • availability: In Stock
  • options: Ship-to-home
  • started: March 26, 2026
for models: xs500, rd400, 530, for makes: yamaha, for years: 1979, part type: sprocket, country of origin: taiwan,
category: motorcycle parts > motorcycle scooter parts accessories, sku: 21402644318070723,
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1 offer $34.88 USD
  • New. Offer #1 priced at $34.88 + $0.00 shipping estimate = $34.88* total. Item Overview. Included: 37T Rear Sprocket.FREE SHIPPING

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